Node.js无法获取生成的进程的输出

Question

This code get output of spawned process . What is wrong? node version is v0.10.22

var spawn = require('child_process').spawn;
var what = 'java';
var spawned = spawn(what,  ['-version']);

console.log('starting `'+what+' -version`');

spawned.stdout.setEncoding('utf8');
spawned.stdout.on('data', function (data) {
    console.log(data);
});

spawned.on('close', function (code) {
    console.log('process exit code ' + code);
});

var whendone = function() {
    console.log('done');
};
setTimeout(whendone,5000);

As you can see I even added some timeout to wait for a launched process to finish.

Answer 1

java -version写入stderr 。